mathematics

If a person walks at 4 mph, he covers a certain distance. If he walks at
9 mph, he covers 7.5 miles more. How much distance did he actually cover?

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  1. let the time be t hours
    at 4 mph, the person covers 4t miles
    at 9 mph, the person covers 9t miles
    9t - 4t = 7.5

    carry on ...

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    Reiny

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